/*
 * 	
 *	Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */
 
/*
 *	markup example for $("#slider").easySlider();
 *	
 * 	<div id="slider">
 *		<ul>
 *			<li><img src="images/01.jpg" alt="" /></li>
 *			<li><img src="images/02.jpg" alt="" /></li>
 *			<li><img src="images/03.jpg" alt="" /></li>
 *			<li><img src="images/04.jpg" alt="" /></li>
 *			<li><img src="images/05.jpg" alt="" /></li>
 *		</ul>
 *	</div>
 *
 */ 

(function($) {

    $.fn.easySlider = function(options) {

        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: 'Previous',
            nextId: 'nextBtn',
            nextText: 'Next',
            controlsShow: false,
            controlsBefore: '',
            controlsAfter: '',
            controlsFade: true,
            firstId: 'firstBtn',
            firstText: 'First',
            firstShow: false,
            lastId: 'lastBtn',
            lastText: 'Last',
            lastShow: false,
            vertical: false,
            speed: 800,
            auto: false,
            pause: 2000,
            continuous: false,
            bgColor: '',
            indexToFocus: 0
        };

        var options = $.extend(defaults, options);


        this.each(function() {
            var obj = $(this);

            var s = $("li", obj).length;
            var w = options.itemWidth; 			//$("li", obj).width(); 
            var h = options.itemHeight; 			//$("li", obj).height(); 
            var numDisplay = options.numDisplay;
            var eachMargin = options.eachMargin;
            var eachWidth = options.itemWidth;
            var indexToFocus = options.indexToFocus;

            obj.width((w * numDisplay) + (eachMargin * (numDisplay)));
            //alert(obj.width());
            //alert(w + " " + numDisplay + " " + obj.width() + " " + eachMargin);
            //obj.height(h); removed for new wireframe
            obj.css("overflow", "hidden");
            obj.css("float", "left");
            obj.css("background-color", options.bgColor); //removed for new wireframe
            //alert(options.bgColor);	
            var pos = obj.offset();


            var prev = $("a", "#" + options.prevId);
            var next = $("a", "#" + options.nextId);

            var prevPos = prev.offset();
            var top = pos.top;
            var left = pos.left;

            var ts = s - 1;
            var t = 0;
            $("ul", obj).css('width', s * w);
            if (!options.vertical) $("li", obj).css('float', 'left');

            if (options.controlsShow) {
                var html = options.controlsBefore;
                if (options.firstShow) html += '<span id="' + options.firstId + '"><a href=\"javascript:void(0);\">' + options.firstText + '</a></span>';
                html += ' <span id="' + options.prevId + '"><a href=\"javascript:void(0);\">' + options.prevText + '</a></span>';
                html += ' <span id="' + options.nextId + '"><a href=\"javascript:void(0);\">' + options.nextText + '</a></span>';
                if (options.lastShow) html += ' <span id="' + options.lastId + '"><a href=\"javascript:void(0);\">' + options.lastText + '</a></span>';
                html += options.controlsAfter;
                $(obj).after(html);
            };


            //Added during refresh phase 2
            if ((s / 2) <= numDisplay) {
            
                //Hide the next button, we have less items than number set to display                
                $get(options.nextId).style.visibility = "hidden";                
            }

            $("a", "#" + options.nextId).click(function() {
                animate("next", true);
            });
            $("a", "#" + options.prevId).click(function() {
                animate("prev", true);
            });
            $("a", "#" + options.firstId).click(function() {
                animate("first", true);
            });
            $("a", "#" + options.lastId).click(function() {
                animate("last", true);
            });


            //Check to add IndextoScroll to

            var objectFocused = false;

            if (indexToFocus && !options.vertical && indexToFocus > numDisplay && indexToFocus <= (s / 2)) {
                $("ul", obj).animate(
						{ marginLeft: ((indexToFocus - numDisplay) * (eachWidth + eachMargin)) * -1 },
						100);


                //We have moved to the right, so reset the starting point and display back button
                t = indexToFocus - numDisplay;
                $("a", "#" + options.prevId).show();

                //If this is the last, hide the next buttion
                if (indexToFocus * 2 == s) {
                    $("a", "#" + options.nextId).hide();
                }

                objectFocused = true;

            }


            function animate(dir, clicked) {
                var ot = t;
                switch (dir) {
                    case "next":
                        t = (ot >= ts) ? (options.continuous ? 0 : ts) : t + 1;
                        break;
                    case "prev":
                        t = (t <= 0) ? (options.continuous ? ts : 0) : t - 1;
                        break;
                    case "first":
                        t = 0;
                        break;
                    case "last":
                        t = ts;
                        break;
                    default:
                        break;
                };


                var diff = Math.abs(ot - t);
                var speed = diff * options.speed;
                if (!options.vertical) //horizontal slider
                {
                    //Divide length by 2 cos of the image spacers
                    var pMax = (((s / 2) - (numDisplay - 1)) * (eachWidth + eachMargin));
                    p = (t * (w + eachMargin) * -1);

                    //alert(pMax + ', ' + p);

                    //Added during refresh
                    if (t + numDisplay == (s / 2)) {

                        $("a", "#" + options.nextId).hide();
                    }
                    else {
                        $("a", "#" + options.nextId).show();
                    }

                    if (p == -pMax && dir == "next") {

                        p = -(pMax + eachWidth + eachMargin);
                        $("a", "#" + options.nextId).hide();

                    }
                    else {
                        $("ul", obj).animate(
						{ marginLeft: p },
						speed
					  );

                        //Perform a second check to remove the next button
                        if (((s / 2) - numDisplay) == t) {
                            p = -(pMax + eachWidth + eachMargin);
                            $("a", "#" + options.nextId).hide();

                        }

                    }
                    if (t == 1) {
                        //$("a","#"+options.prevId).hide();
                    }
                }
                else {
                    p = (t * h * -1);
                    $("ul", obj).animate(
						{ marginTop: p },
						speed
					);
                };

                if (!options.continuous && options.controlsFade) {
                    if (t == ts) {
                        $("a", "#" + options.nextId).hide();
                        $("a", "#" + options.lastId).hide();
                    } else {
                        //$("a","#"+options.nextId).show();
                        $("a", "#" + options.lastId).show();
                    };
                    if (t == 0) {
                        $("a", "#" + options.prevId).hide();
                        $("a", "#" + options.firstId).hide();
                    } else {
                        $("a", "#" + options.prevId).show();
                        $("a", "#" + options.firstId).show();
                    };
                };

                if (clicked) clearTimeout(timeout);
                if (options.auto && dir == "next" && !clicked) {
                    ;
                    timeout = setTimeout(function() {
                        animate("next", false);
                    }, diff * options.speed + options.pause);
                };

            };
            // init
            var timeout;
            if (options.auto) {
                ;
                timeout = setTimeout(function() {
                    animate("next", false);
                }, options.pause);
            };

            if (!options.continuous && options.controlsFade) {

                if (objectFocused == false) {
                    //There is an index focused so don't display it
                    $("a", "#" + options.prevId).hide();
                }
                $("a", "#" + options.firstId).hide();
            };

        });

    };


})(jQuery);